An Extensible Message Format for Delivery Status Notifications
Keith M. Moore, G. Vaudreuil · 2003
This memo defines a MIME content-type that may be used by a message transfer agent (MTA) or electronic mail gateway to report the result of an attempt to deliver a message to one or more recipients. This content-type is intended as a machine-processable replacement for the various types of delivery status notifications currently used in Internet electronic mail.